在工业涂装过程中，会因外界人、环境或设备等因素影响涂装外观质量及涂装涂膜性能等.
参考答案：对
I could easily perceive that his heart burnt to relieve his starving kids, but he seemed ashamed to ______ his inability to me.
A. discover B. recover C. demonstrate D. impress
杂技演员在做“水流星”表演时，用一根细绳两端各系一只盛水的杯子，抡起绳子，让杯子在竖直面内做半径相同的圆周运动，如图所示.杯内水的质量m＝0.5 kg，绳长l＝60 cm ，g=10m/s2.求：
（1）在最高点水不流出的最小速率．
（2）水在最高点速率v＝3 m/s时，水对杯底的压力大小．
